/* Copyright (c) 2015, Nordic Semiconductor ASA
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   * Redistributions of source code must retain the above copyright notice, this
 *     list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *
 *   * Neither the name of Nordic Semiconductor ASA nor the names of its
 *     contributors may be used to endorse or promote products derived from
 *     this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 */

#ifndef SYSTEM_NRF51_H
#define SYSTEM_NRF51_H

#ifdef __cplusplus
extern "C"
{
#endif

#include <stdint.h>

    extern uint32_t SystemCoreClock; /*!< System Clock Frequency (Core Clock)  */

    /**
     * Initialize the system
     *
     * @param  none
     * @return none
     *
     * @brief  Setup the microcontroller system.
     *         Initialize the System and update the SystemCoreClock variable.
     */
    extern void SystemInit(void);

    /**
     * Update SystemCoreClock variable
     *
     * @param  none
     * @return none
     *
     * @brief  Updates the SystemCoreClock with current core Clock
     *         retrieved from cpu registers.
     */
    extern void SystemCoreClockUpdate(void);

#ifdef __cplusplus
}
#endif

#endif /* SYSTEM_NRF51_H */
